<template>
  <div class="bottom-menu">
    <check-button class="select-all" @checkBtnClick="checkBtnClick" :is-checked="isSelectAll"></check-button>
    <span>全选</span>
    <span class="total-price">合计: ¥{{ totalPrice }}</span>
    <span class="buy-product" @click="calcClick">去计算({{ selectLength }})</span>
  </div>
</template>

<script>
import CheckButton from "./CheckButton";
import {mapGetters} from 'vuex'

export default {
  name: "CartBottomBar",
  components: {CheckButton},
  computed: {
    ...mapGetters([
      'cartList',
      'cartLength'
    ]),
    totalPrice() {
      const cartList = this.cartList;
      return cartList.filter(item => {
        return item.checked
      }).reduce((preValue, item) => {
        return preValue + item.count * item.price
      }, 0).toFixed(2)
    },
    isSelectAll() {
      if(this.cartList.length===0) return false
      return this.cartList.find(item => item.checked === false) === undefined;
    },
    selectLength(){
      return this.cartList.filter(item=>item.checked).length;
    }
  },
  methods: {
    checkBtnClick() {
      // 1.判断是否有未选中的按钮
      let isSelectAll = this.$store.getters.cartList.find(item => !item.checked);
      // let isSelectAll = this.cartList.find(item => !item.checked);

      // 2.有未选中的内容, 则全部选中
      if (isSelectAll) {
        this.$store.state.cartList.forEach(item => {
          item.checked = true;
        });
      } else {
        this.$store.state.cartList.forEach(item => {
          item.checked = false;
        });
      }
    },
    calcClick(){
      if(!this.isSelectAll)
        this.$toast({message:'请选择购买的商品'})
    }
  }
}
</script>

<style scoped>
.bottom-menu {
  width: 100%;
  height: 44px;
  background-color: #eee;
  position: fixed;
  bottom: 49px;
  left: 0;
  box-shadow: 0 -2px 3px rgba(0, 0, 0, .2);
  font-size: 14px;
  color: #888;
  line-height: 44px;
  padding-left: 35px;
  box-sizing: border-box;
}

.bottom-menu .select-all {
  position: absolute;
  line-height: 0;
  left: 12px;
  top: 13px;
}

.bottom-menu .total-price {
  margin-left: 15px;
  font-size: 16px;
  color: #666;
}

.bottom-menu .buy-product {
  background-color: orangered;
  color: #fff;
  width: 100px;
  height: 44px;
  text-align: center;
  line-height: 44px;
  float: right;
}
</style>
